第2个回答 2011-11-02
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
<script type="text/javascript">
function isEnable(){
var cont=document.getElementById("_content");
if(cont.value==""){
document.getElementById("_btn1").disabled="disabled";
document.getElementById("_btn1").value="不能点击";
}else{
document.getElementById("_btn1").disabled="";
document.getElementById("_btn1").value="可以点击";
}
}
</script>
</head>
<body>
<input type="text" id="_content" name="content" onfocus="isEnable()" onblur="isEnable()" onkeyup="isEnable()">
<input type="button" value="不能点击" id="_btn1" name="btn1" disabled="disabled" onclick="isEnable()">
</body>
</html>